How should a team validate DNS security filtering in practice?

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Define the expected outcome&mdash;blocks resolution of known malicious or prohibited domains&mdash;and test it with realistic scenarios. Record the owner, scope, evidence, exceptions and review date. Combine technical testing with operational confirmation so a configured control is not mistaken for an effective control.NIST Cybersecurity Framework 2.0: https://www.nist.gov/cyberframework